package com.ruoyi.common.utils.bean;

import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.Objects;
import java.util.stream.Collectors;

import cn.hutool.core.util.StrUtil;
import com.ruoyi.common.constant.Constants;
import lombok.extern.slf4j.Slf4j;


@Slf4j
public class ObjUtil {


    /**
     * @desc 将对象转换成指定String
     * @param <T>
     * @param t
     * @return
     */
    public static <T> String toStr(T t) {
        List<String> list = new ArrayList<String>();
        String[] fieldNames = getFiledName(t);
        for (int i = 0; i < fieldNames.length; i++) {
            String name = fieldNames[i];
            Object value = getFieldValueByName(name, t);
            if (null != value && StrUtil.isNotBlank(value.toString())) {
                if (getFiledType(name, t).equals(Date.class)) {
                    value = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format((Date)value);
                }
                list.add(name + Constants.ENTRY_D + value);
            }
        }
        String resultStr = list.stream().sorted().collect(Collectors.joining(Constants.FIELD_D));
        return resultStr;
    }

    /**
     * @desc 获取属性名数组
     * @param o
     * @return
     */
    private static String[] getFiledName(Object o) {
        Field[] fields = o.getClass().getDeclaredFields();
        String[] fieldNames = new String[fields.length];
        for (int i = 0; i < fields.length; i++) {
            fieldNames[i] = fields[i].getName();
        }
        return fieldNames;
    }

    /**
     * @desc 根据属性名获取属性值
     * @param fieldName
     * @param o
     * @return
     */
    private static Object getFieldValueByName(String fieldName, Object o) {
        try {
            String firstLetter = fieldName.substring(0, 1).toUpperCase();
            String getter = "get" + firstLetter + fieldName.substring(1);
            Method method = o.getClass().getMethod(getter, new Class[] {});
            Object value = method.invoke(o, new Object[] {});
            return value;
        } catch (Exception e) {
            log.error("获取属性值失败！" + e, e);
        }
        return null;
    }

    /**
     * @desc 获取属性的数据类型
     * @param fieldName
     * @param o
     * @return
     */
    private static Object getFiledType(String fieldName, Object o) {
        Field[] fields = o.getClass().getDeclaredFields();
        for (Field field : fields) {
            if (Objects.equals(fieldName, field.getName())) {
                return field.getType();
            }
        }
        return null;
    }

}
